| Summary: | During the past several years, the frequency of discovery of new molecular entities based on γ- or δ-lactam scaffolds has increased continuously. Most of them are characterized by the presence of at least one chiral center. Herein, we present the preparation, isolation and the absolute configuration assignment of enantiomeric 2-(4-bromophenyl)-1-isobutyl-6-oxopiperidin-3-carboxylic acid (<i>trans</i>-<b>1</b>). For the preparation of racemic <i>trans</i>-<b>1</b>, the Castagnoli-Cushman reaction was employed. (Semi)-preparative enantioselective HPLC allowed to obtain enantiomerically pure <i>trans</i>-<b>1</b> whose absolute configuration was assigned by X-ray diffractometry. Compound (+)-(<i>2R,3R</i>)-<b>1</b> represents a reference compound for the configurational study of structurally related lactams.
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